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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Mar-31-2018, 04:04:25 PM   #1
Like I Stole It
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Default Trust Waze or the speedo?

Took a short road-trip and was leveraging Waze for directions and detail. I noticed that at highway speed the speedo was reading 5-6 mph higher than Waze. I would think that there could be a couple things playing into it - though admittedly I've not looked up the wheel speed sensor calcs - wheel size, tire size, and the car's general mood. So, the question is which one to trust - Waze or the speedo?
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Old Sat, Mar-31-2018, 04:04:55 PM   #2
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Default Re: Trust Waze or the speedo?

Waze. Speedo reads high.
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Old Sat, Mar-31-2018, 04:05:58 PM   #3
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Default Re: Trust Waze or the speedo?

Our speedo reads faster. IIRC 7% faster if you're on stock wheel and tire sizes. You can adjust this with software but I forgot which program.


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Old Sat, Mar-31-2018, 04:17:06 PM   #4
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Default Re: Trust Waze or the speedo?

That's a significant delta - what reason would a manufacturer have for a consistently fast reading?
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Old Sat, Mar-31-2018, 04:21:51 PM   #5
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Default Re: Trust Waze or the speedo?

GPS. By extension - Waze to some degree.
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Old Sat, Mar-31-2018, 04:32:53 PM   #6
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Default Re: Trust Waze or the speedo?

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Originally Posted by Like I Stole It View Post
That's a significant delta - what reason would a manufacturer have for a consistently fast reading?
Most cars overstate speed by 5-10%. I think there are severe regulatory penalties if a manufacturer understates speed, so most build in this cushion.
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Old Sat, Mar-31-2018, 04:44:44 PM   #7
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Default Re: Trust Waze or the speedo?

I would recommend using a specific GPS application, such as gps status, rather than waze. I would also recommend that you not have any other apps running in the background.
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Old Mon, Apr-02-2018, 02:19:50 AM   #8
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Default Re: Trust Waze or the speedo?

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Originally Posted by EYEHAVEYOU View Post
Most cars overstate speed by 5-10%. I think there are severe regulatory penalties if a manufacturer understates speed, so most build in this cushion.
BMW is the only manufacturer I have driven which is constantly off in all of there vehicles. I am sure they are not the only ones, but I have driven plenty of American cars in which gps speed and speedo match, not sure why on stock wheels/tires BMW cannot make this happen.
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Old Mon, Apr-02-2018, 02:46:59 AM   #9
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Default Re: Trust Waze or the speedo?

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BMW is the only manufacturer I have driven which is constantly off in all of there vehicles. I am sure they are not the only ones, but I have driven plenty of American cars in which gps speed and speedo match, not sure why on stock wheels/tires BMW cannot make this happen.
They *can*. Internally the calculation is spot on. Apparently German laws force them to deliberately introduce an error. And I guess they figure they don't have to fix it for the US.
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Old Mon, Apr-02-2018, 03:07:13 AM   #10
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Default Re: Trust Waze or the speedo?

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Originally Posted by lmtfi View Post
GPS. By extension - Waze to some degree.
This. Waze is likely *more* accurate than the car's speedo, but I'd want something like a Performance Box or several different GPS-based solutions averaged together to get a number that's as close to true as possible.
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Discussing Torque Spec thread in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)